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Eating Eggs Does Not Harm Arteries
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David L. Katz, , Marian A. Evans, Haq Nawaz, Valentine Yanchou Njike, Wendy Chan, Beth Patton Comerford and Martha L. Hoxley Egg consumption and endothelial function: a randomized controlled crossover trial. International Journal of Cardiology 2005; 99: 65-70
Yale Prevention Research Center, 130 Division Street, Derby, CT 06418, USA
Abstract
Background: Because of egg cholesterol content, reduction in egg consumption is generally recommended to reduce risk of cardiovascular disease. Recently, however, evidence has been accumulating to suggest that dietary cholesterol is less relevant to cardiovascular risk than dietary saturated fat. This randomized controlled crossover trial was conducted to determine the effects of egg ingestion on endothelial function, a reliable index of cardiovascular risk.
Methods: Forty-nine healthy adults (mean age 56 years, 40% females) underwent a baseline brachial artery reactivity study (BARS), and were assigned to two eggs or oats daily for 6 weeks in random sequence with a 4-week washout. A BARS was done at the end of each treatment phase, measuring flow-mediated vasodilation (FMD) in the brachial artery using a high-frequency ultrasound.
Results: FMD was stable in both egg and oat groups, and between-treatment differences were not significant (egg -0.96%, oatmeal -0.79%; p value >0.05). Six weeks of egg ingestion had no effect on total cholesterol (baseline: 203.8 mg/dl; post-treatment: 205.3) or LDL (baseline: 124.8 mg/dl; post-treatment: 129.1). In contrast, 6 weeks of oats lowered total cholesterol (to 194 mg/dl; p=0.0017) and LDL (to 116.6 mg/dl; p=0.012). There were no differences in body mass index (BMI), triglyceride, HDL or SBP levels between egg and oat treatment assignments.
Conclusion: Short-term egg consumption does not adversely affect endothelial function in healthy adults, supporting the view that dietary cholesterol may be less detrimental to cardiovascular health than previously thought.
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COMMENT: I never thought that eggs did do any harm. I have yet to find any evidence that eggs are anything other than an entirely healthy food (so long as they haven't been tampered with — I'm thinking of 'omega-3 eggs'). You might like a couple of anecdotes on eggs.
Firstly, Dr Uffe Ravnskov, the founder of The International Network of Cholesterol Skeptics decided to test the theory that eggs raised blood cholesterol levels. So he ate 59 eggs in nine days. His cholesterol went down by 11%.
Vilhjalmur Stefansson tells a lovely story in his autobiography, Discovery,
about Lord Strathcona, Canada's High Commissioner to England in the late
19th century. Lord Strathcona ate very little other than eggs — and lived
well into his 94 year.
Stefansson writes:
"My first contacts with him were merely casual occasions for him to use his
position as Canada's High Commissioner to expedite the work of the Canadian
Arctic Expedition. It was not long, however, before there grew up between
us the bond of a common interest — an interest in dietary matters. I told
him what I had learned from the Eskimos, and he told me that years ago in
Canada he had begun a regimen all his own by skipping lunch and ultimately
breakfast too. Then he had begun to wonder why, since he liked some things
better than others, he should bother to eat something different on Tuesday
when he had liked what he had eaten on Monday better. This led to his
questioning what he really did like and, when he got the answer, eating
nothing else — eggs, milk, and butter. Although this combination would not
have made up my favorite meal, much as I favor butter, the point was that
Strathcona and I were in agreement on the feeling that the longer a man ate
one complete food exclusively, the more likely he was to relish it.
"I had many opportunities to observe the High Commissioner while I was in
London, for he frequently invited me to dinner at his home in Grosvenor
Square, saying that So-and-So would be present and he thought I would like
to meet him. Strathcona, a broad-shouldered man taller than six feet, would
be seated at one end of the long table, Lady Strathcona at the other. As
course after course was served to the rest of us, he would converse,
drinking a sip or two of each wine as it was poured. Sometime during the
middle of the dinner, his tray was brought: several medium-soft boiled eggs
broken into a large bowl, with plenty of butter and with extra butter in a
side dish, and, I believe, a quart of whole milk, or perhaps half-and-half.
My impression is that they also brought him toast, but that he barely
nibbled it, using it a bit as if it were a napkin."
So much for "5 portions of fruit and vegetables"!
Last updated 9 April 2005
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